It's been addressed before that it's not ethical to list something you haven't done (like listing you have 100 hrs of shadowing that you haven't done but are planning on doing in the summer). They'll never check, though. So it's all on you if you have the conscience to put it down.
AADSAS allows you to list activities that are still ongoing (you need a start date but can leave the end date blank if you're still participating in it). So what I recommend you do (if you haven't submitted your app yet) is to get on the ball and get involved in a place where you can get experience ASAP and list it on your app. List the hours you have as 0 (or how ever many you have done by the time you submit) and then leave the end date blank. That way you're not being dishonest but are also showing schools that you are getting experience.